Kiwifruit growers whose vines were hit by the PSA disease are braced for a critical High Court decision this morning.

More than 200 growers have been battling to have MPI held responsible for the outbreak that caused hundreds-of-millions-of-dollars worth of damage to the North Island kiwifruit industry.

Kiwifruit Claim Committee chairman John Cameron insists Biosecurity negligence led to the disease being introduced in 2009.

He believes today's court decision will fall in favour of the growers.

"We believe that we had the evidence in front of the judge to support that MPI was responsible for PSA entering New Zealand."

The growers say MPI gave clearance on a shipment of kiwifruit material from China that was infected by PSA.